Multi-component copolymer, rubber composition, crosslinked rubber composition and rubber article

Patent metadata

Field	Value
Publication number	US-10550216-B2
Application number	US-201615766061-A
Country	US
Kind code	B2
Filing date	Oct 11, 2016
Priority date	Oct 16, 2015
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

Provided is a multi-component copolymer having excellent crack growth resistance and wear resistance. The multi-component copolymer comprises conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a peak top molecular weight of non-conjugated olefin parts linking only the non-conjugated olefin units is 500 or more and less than 40,000.

First claim

The invention claimed is:

1. A multi-component copolymer comprising conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein:
the non-conjugated olefin units consist exclusively of ethylene units, and
a peak top molecular weight of non-conjugated olefin parts linking only the non-conjugated olefin units is 500 or more and less than 40,000.

2. The multi-component copolymer according to claim 1 , wherein:
a degree of crystallinity of the non-conjugated olefin parts is 5% or more and 45% or less.

3. The multi-component copolymer according to claim 1 , wherein:
a crystal fusion heat of the non-conjugated olefin parts is 3 J/g or more and 60 J/g or less.

4. The multi-component copolymer according to claim 1 , having a melting point of 40° C. or more and 130° C. or less.

5. The multi-component copolymer according to claim 1 , wherein:
the aromatic vinyl units comprise styrene units.

6. The multi-component copolymer according to claim 1 , wherein:
the conjugated diene units comprise 1,3-butadiene units and/or isoprene units.

7. The multi-component copolymer according to claim 1 , being a tricopolymer consisting exclusively of 1,3-butadiene units as the conjugated diene units, ethylene units as the non-conjugated olefin units, and styrene units as the aromatic vinyl units.

8. The multi-component copolymer according to claim 1 , having a polystyrene equivalent weight-average molecular weight of 100,000 to 800,000.

9. A rubber composition comprising the multi-component copolymer according to claim 1 .

10. The rubber composition according to claim 9 , comprising 10 mass % or more of the multi-component copolymer in 100 mass % of a rubber component.

11. A crosslinked rubber composition being a crosslinked product of the rubber composition according to claim 9 .

12. A rubber article comprising the crosslinked rubber composition according to claim 11 .

13. The rubber article according to claim 12 , being a tire.

14. The multi-component copolymer according to claim 2 , wherein:
a crystal fusion heat of the non-conjugated olefin parts is 3 J/g or more and 60 J/g or less.

15. The multi-component copolymer according to claim 2 , having a melting point of 40° C. or more and 130° C. or less.

16. The multi-component copolymer according to claim 2 , wherein:
the aromatic vinyl units comprise styrene units.

17. The multi-component copolymer according to claim 2 , wherein:
the conjugated diene units comprise 1,3-butadiene units and/or isoprene units.

Assignees

• Bridgestone Corp

Inventors

• Kimura Madoka
• Oishi Shigeki
• Tanabe Tomoe

Classifications

• C08F236/10 Primary

  with vinyl-aromatic monomers · CPC title

• C08F212/06

  Hydrocarbons · CPC title

• C08F2810/20

  leading to a crosslinking, either explicitly or inherently · CPC title

• C08F2800/10

  as molar percentages · CPC title

• C08L25/02

  Homopolymers or copolymers of hydrocarbons · CPC title